Does anyone have any tips or methods used to set up and tune a small PA?

I've
got a pair of JBL FOH speakers (PRX615M), a pair of EON 315's for fold back and a 31 band
eq for each channel (DBX 231+1231). Generally the PA is setup and packed down for every
gig and the venues are rarely the same

I've read about ringing out the
speakers, which seems like it gives a good starting point for controlling feedback and
getting the most volume from the system, but does that mean it will sound good to the
audience?

For the most part, only vocals and acoustic guitars will be run
through the PA with bands from duo’s to rock bands up to 5 people in small venues with
no dedicated engineer at the controls.